Pretreatment method for enhancing BOD (biochemical oxygen demand) absolute value of chemical waste acid

A pretreatment, absolute value technology, applied in the field of water treatment, to achieve the effect of increasing the absolute value of BOD, easy operation, and good biodegradability

Inactive Publication Date: 2013-04-03
HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, rare earth metals are mainly used in the fields of denitrification, desulfurization, automobile exhaust purification and photocatalysis in China. The application in the field of water treatment is still in the primary development stage, and basically limited to the use of rare earths to prepare composite adsorbents and coagulants. However, there are no reports at home and abroad on the combined use of rare earth metals and iron-carbon micro-electrolysis technology for the pretreatment process of industrial waste acid to increase the absolute value of BOD.

Method used

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  • Pretreatment method for enhancing BOD (biochemical oxygen demand) absolute value of chemical waste acid
  • Pretreatment method for enhancing BOD (biochemical oxygen demand) absolute value of chemical waste acid
  • Pretreatment method for enhancing BOD (biochemical oxygen demand) absolute value of chemical waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 100 tons / day chemical waste acid treatment project in a printing and dyeing factory.

[0026] The measured water quality of the chemical waste acid raw water is shown in the following table:

[0027] item number

project

measured value

1

pH value

0.42

2

COD Cr

7850mg / L

3

BOD 5

350mg / L

4

B / C

0.045

5

Chroma

1200 times

[0028] according to figure 1 Shown flow process, water quality is adjusted in the present embodiment:

[0029] The chemical waste acid in the printing and dyeing factory enters the regulating tank through the pipeline to adjust the water quality and balance the water volume, so that the flow and parameters of the chemical waste acid of different properties from all over the printing and dyeing factory can be fully adjusted to facilitate the treatment of subsequent units, and hydrogen is added to the regulating tank Sodium oxide solution, adjust the pH ...

Embodiment 2

[0039] The raw water quality of chemical waste acid is the same as that of Example 1 above.

[0040] 1) Regulate water quality. The chemical waste acid in the printing and dyeing factory enters the regulating tank through the pipeline to adjust the water quality and balance the water volume, so that the flow and parameters of the chemical waste acid of different properties from all over the printing and dyeing factory can be fully adjusted to facilitate the treatment of subsequent units, and hydrogen is added to the regulating tank Sodium oxide solution, adjust the pH value to 2.5.

[0041] 2) Ozone pretreatment of waste acid: After adding 780 mg / L rare earth compound to the adjusted chemical waste acid, pass through ozone for pre-reaction for 5 minutes. At this time, the pH of the waste acid solution is 2.7.

[0042] 3) Rare earth-iron carbon micro-electrolysis. Add 7850 mg / L of activated iron filings and 520 mg / L of carbon particles into the micro-electrolytic cell. Open ...

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Abstract

The invention discloses a water treatment technique, particularly a pretreatment method for enhancing BOD (biochemical oxygen demand) absolute value of chemical waste acid. Water quality regulation, pretreatment of chemical waste acid with ozone, rare earth-iron carbon micro-electrolysis, ozone catalytic treatment, neutralization, settling and other steps are carried out to effectively enhance the BOD absolute value of the chemical waste acid, thereby lowering the difficulty of subsequent biochemical treatment. The invention greatly lowers the treatment difficulty of subsequent conventional biochemical reaction, has the advantages of favorable treatment effect, low cost and the like, can treat waste with waste, and is simple to operate.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a pretreatment method for increasing the absolute value of BOD of chemical waste acid. Background technique [0002] Industrial waste acid mainly comes from coal mines, chemical industry, printing and dyeing, metallurgy and other industrial sectors, and these industries are the economic lifelines of all countries. They are widely distributed and have a large amount of sewage, accounting for a large proportion of industrial wastewater. Industrial waste acid has the characteristics of strong acidity, complex water quality components, high chroma, and low biological oxygen demand / chemical oxygen demand (BOD / COD). It is very difficult and costly to treat it through biochemical methods. [0003] Iron-carbon micro-electrolysis technology is a treatment process based on scrap iron scraps and activated carbon. It has the advantages of treating waste with waste, good treatment eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
Inventor 魏状童少平白植行朱显跃于梅
Owner HANGZHOU CHENGJIE ENVIRONMENTAL PROTECTION
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